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| tyre valve thread size |
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| jim:
i was just looking around the shed for some taps/dies. found some nuts off tyre valves (i always save them, never seam to need them!). just wondering what thread they were :scratch: found this http://www.gewinde-normen.de/en/valve-thread.html its a .305" 32tpi / 7,747 x .794 pitch thread. unless i'm missing something, how on earth did we end up with a thread that is neither metric or a fractional imp size :scratch: :scratch: and whilst i'm on the subject, its bothered me for a long time that tyres are both imperial (dia in inches) and metric (the width) ::) ::) ::) i'm going to use the nuts on my poppin engine, just need to "pick up" the thread and open out a bit, it'll bother someone one day that i used M8 .8mm pitch threads :lol: :lol: :lol: :lol: :lol: |
| Stilldrillin:
Jim, There are some things in this life, it is better not to know..... :D I once thought about those sizes, when I was an apprentice learning to measure things. :wave: I never did find out....... That was 50 yrs ago! ::) David D |
| sbwhart:
Jim Thats near as dam it 3/16 * 32 Model Engineering thread you can get taps and dies from a number of suppliers try Tracey Tools. Hope this helps Srew |
| mklotz:
--- Quote ---Thats near as dam it 3/16 * 32 --- End quote --- Huh? How's that? 3/16 = 0.1875 ~= 0.305 ? Yep, true for small values of 0.3. :) (or is this one of those weird British things like hundredweights that weigh 112 lbs?) |
| tel:
In my experience the threads on Schraeder valves are always 5/16" x 40 tpi - don't ask me why. |
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